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			<img src="./img/blank.gif" data-echo="http://e.hiphotos.baidu.com/image/pic/item/f9dcd100baa1cd1186ce8822bb12c8fcc3ce2dbc.jpg" />
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		<div class="pic">
			<img src="./img/blank.gif" class="img" data-echo="http://b.hiphotos.baidu.com/image/pic/item/0b55b319ebc4b745924fa817cdfc1e178b8215d3.jpg" />
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</html>
<script src="./js/echo.js"></script>
<script>
	//github https://github.com/iWenli/echo
	
	  echo.init({
		offset: 0,	//	指定距离视窗上下左右位置图片预加载 Number|String Default: 0
		throttle: 250,	//	延迟加载  Number|String	Default: 250
		unload: true,	
		callback: function (element, op) {
		  // console.log(element, 'has been', op + 'ed')
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</script>